Shooting grouse with guns for good or bad comes under the organized sport banner.
Same thing that lets us ride Audax or CTC rides (but not stop at a café which kind of defeats the purpose of those rides)
One of the problems with breeding so many thick as feck birds for shooting, is that if you don't then shoot them you've got an even bigger mono-culture problem than the one you created by disposing of all their predators in the first place.
See also Deer, the population is rampant partly due to the lack of people shooting them 10 years ago, to a point where they're starting to cause damage to the environment since we disposed of their only other predator (wolf).
But of course most of the venison bought in shops comes from farms, which seems mad when you can pop out with a gun and collect one for feck all...
Or in my case the car. FFS.